Collaborative: Phylogeny, Character Evolution, and Diversification of Extant Ferns

合作：现存蕨类植物的系统发育、性状进化和多样化

• 批准号: 9616260
• 负责人: Alan Smith
• 金额: $ 2.56万
• 依托单位: University of California-Berkeley
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1997
• 资助国家: 美国
• 起止时间: 1997-03-15 至 2002-02-28
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9616260&HistoricalAwards=false
• 关键词: Collaborative; Phylogeny; Character; Evolution; Diversification

9616260 Smith In a three-institution collaboration with colleagues at Utah State University and Chicago's Field Museum of Natural History, Dr. Alan Smith at University of California at Berkeley is amassing a major database of molecular and morphological characters of representatives of the 30 or so families of living ferns, in order to construct an overall phylogenetic framework for ferns. Building upon the impressive results of a 1994 symposium of fern specialists, with an international team that produced preliminary results for this effort (published in 1995), Smith and his colleagues are continuing a major DNA sequencing project for four genes, two from the chloroplast genome and two from the nucleus, that hold promise of yielding informative variation for genealogical analyses. This molecular database in turn is to be supplemented with traditional anatomical and morphological features drawn from the vegetative and reproductive parts of the same ferns analyzed for their DNA, features used standardly in their taxonomic identification and classification. A well-resolved phylogeny for ferns will facilitate future work on the patterns and sequences of character evolution that gave rise to the Cretaceous radiation and diversification of the major group of ferns, the "polypodiaceous" group, and will provide a foundation for family- and genus-level taxonomic revisionary research. Using comparative methods, researchers can explore patterns of association among characters for correlated evolutionary changes, that may help explain the success or failure (extinction) of various lineages within the ferns.

9616260 Smith 加州大学伯克利分校的 Alan Smith 博士与犹他州立大学和芝加哥菲尔德自然历史博物馆的同事进行了三个机构的合作，正在收集大约 30 个现存蕨类植物科代表的分子和形态特征的主要数据库，以便构建蕨类植物的整体系统发育框架。在 1994 年蕨类专家研讨会令人印象深刻的成果的基础上，史密斯和他的同事们与一个为这项工作取得初步结果（于 1995 年发表）的国际团队一起，继续对四个基因（两个来自叶绿体基因组，两个来自细胞核）进行主要 DNA 测序项目，这有望为谱系分析产生信息丰富的变异。反过来，该分子数据库将补充传统的解剖学和形态学特征，这些特征取自同一蕨类植物的营养和生殖部分，并对其 DNA 进行分析，这些特征是分类学鉴定和分类中标准使用的特征。 蕨类植物的系统发育的良好解决将有助于未来研究特征进化的模式和序列，从而导致白垩纪辐射和蕨类主要类群“水龙骨”类群的多样化，并将为科和属级别的分类学修订研究奠定基础。使用比较方法，研究人员可以探索相关进化变化的性状之间的关联模式，这可能有助于解释蕨类植物中各种谱系的成功或失败（灭绝）。